I installed cmus on a very minimal gentoo setup I have running on a raspberry pi. I'm not an expert with cmus but I've used it enough to know how to load a file. I can't see any files.
I have moved them around, changed ownership, set the filter to "*" and "*.*". Not matter what I try, I can see directories, but not a single file.

I haven't been able to find a similar problem to this, has anyone experienced this?

Please let me know if you need be to post anything. There are no error messages so I wasn't sure what to post.

You might have installed a very bare-bones of cmus, without the support for the files you are trying to load. Pretend to be emerging it, see the available options for USE, and then emerge it with that flags enabled. In the case of MP3, you might have to enable lame or sometthing.